1. Norwegian Institute for Water Research (NIVA), N-4879 Grimstad, Norway.
2. Centre for Coastal Research, University of Agder, N-4604 Kristiansand, Norway.
3. County Governor of Aust- and Vest-Agder, N-4809 Arendal, Norway.
4. Scandinavian Nature Surveillance Ltd., N-7055 Ranheim, Norway.
5. Institute of Marine Research (IMR), N-4817 His, Norway.
6. Faculty of Environmental Sciences and Natural Resource Management, Norwegian University of Life Sciences, NO-1432 Ås, Norway.